A Soluble and Electrically Conducting Polymer System Incorporating Thiophene and Acetylenic Moeities
For the last two and a half decades, conducting polymers have been at the forefront of research activity all over the world. The chemists as well as physicists are interested in this class of polymers due to their potential applications. Several research groups have investigated polythiophene due to its high environmental stability and its conjugated system in both neutral-insulating as well as doped-conducting state.1,2 Researchers have been trying to engineer the monomer system, either by introducing substituents on the thiophene rings or by introduction of spacers, in order to get polymers with desired properties. It has been reported in the literature that the conductivity is largely compromised if an ethylene or an acetylenic spacer is introduced in between the two thiophene rings of the bithiophene monomer.3 However, we have found in our laboratory that such a monomeric system gives polymers with conductivity as high as 2 S cm-1 in doped form apart from having low band gap energy. Moreover, by functionalising the thiophene units, we were able to get electroactive polymers soluble in organic solvents.
KeywordsOxidation Potential Thiophene Ring Electroactive Polymer Dope Polymer Thiophene Unit
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